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post #1 of 7 Old 02-25-2008, 05:23 PM Thread Starter
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Exhaust/Intake Questions

Does anyone know how much power you gained by just doing a free-flow filter and 4'' straight pipe exhaust. What about added mpg? Also how hard is it to install a 3'' downpipe on a 1997 7.3? Thanks.
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post #2 of 7 Old 02-25-2008, 05:28 PM
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i got 2 mpg better and it wasnt hard with the DP takes 2 people, no idea on power but the economy is what matters

2006 F-250 ExtCab SB 4x4 6.0, recon white lightning, ARP head studs, SCT touch Xtreme and soon to come Complete EGR delet y pipe and all
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post #3 of 7 Old 02-25-2008, 05:38 PM Thread Starter
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thanks... yeah the extra mpg's are always great and the added power and sweet sound majke it even better.
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post #4 of 7 Old 02-25-2008, 05:40 PM
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yeah youll love the sound and itll be more responsive also

2006 F-250 ExtCab SB 4x4 6.0, recon white lightning, ARP head studs, SCT touch Xtreme and soon to come Complete EGR delet y pipe and all
Wifes - 2005 Liberty w/ 2.8l diesel!
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Sold - 97 7.3 235k fun miles & 93 5.9 with only 84k
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post #5 of 7 Old 02-25-2008, 06:17 PM
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I started doing a 3" DP today and I have to get the DP in a very tight place tomorrow. Somethings gotta give. Anyone know the best way. The tools I have are hand tools and a sawzall.

97 F-350, 7.3 psd, xlt, limited edition, obs, dually, E40d at, 410 r axle, reg. cab, 8ft bed, 145000 miles, DIY Tymar intake (napa filter) CCV mod. fpr bb mod, HPX crossover pipe, SS Bully steps, Reese Fifth wheel hitch, CB Radio, 3" DP /4" back w/cat delete and 4" flow-thru muffler w/5" tip.
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post #6 of 7 Old 02-26-2008, 06:16 PM
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If your DP is one piece what i did is cut it in half and took it to a muffler shop and had them spead the top part with there machine and put it in two pieces I also had to bend where the fire wall and floor met (air hammer works great)
97 F350 3'' dp 4'' out
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post #7 of 7 Old 02-26-2008, 06:21 PM
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for a OBS you have to have a 2 piece DP a single wont fit. ITs kinda tight but it is pretty easy with 2 guys if possible

2006 F-250 ExtCab SB 4x4 6.0, recon white lightning, ARP head studs, SCT touch Xtreme and soon to come Complete EGR delet y pipe and all
Wifes - 2005 Liberty w/ 2.8l diesel!
Daily Driver - 2006 VW Jetta TDI manual
Sold - 97 7.3 235k fun miles & 93 5.9 with only 84k
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